TLSEngine shutdown triggered by Error: Cannot verify certificate

[armmywg]

When using https to get data, it prompts "TLSEngine shutdown triggered by Error: Cannot verify certificate"

var client:HttpClient = new HttpClient();
var uri:URI = new URI("https://www.baidu.com/");
uri.scheme = "https";
uri.port = "443";
var variables:Array = [ { name: "fname" } ];
client.postFormData(uri,variables);